4. Mumbai, India: 27.8 million people

3. Shanghai, China: 30.8 million people

2. Delhi, India: 36.1 million people

(hadynyah via Getty Images)

1. Tokyo, Japan: 37.2 million people

(kokoroimages.com via Getty Images)

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The Global Cities Institute projects that Kinshasa, in the Democratic Republic of the Congo, will be the most populous city in the world by 2075, and that by 2100, it will be surpassed by the 88 million future residents of Lagos, Nigeria.